(1) The heavens declare the glory of God;
And the firmament shows His handiwork.
(2) Day unto day utters speech,
And night unto night reveals knowledge.
(3) There is no speech nor language
Where their voice is not heard.
(4) Their line has gone out through all the earth,
And their words to the end of the world. In them He has set a tabernacle for the sun,
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In Psalm 19, we have the example of a man who is really tuned into God, which resulted in him writing about one-half of the 150 Psalms. To David, the immense size, radiance, and regularity of the heavenly bodies spoke to him of the wisdom, power, and steadfast character of the God of creation, and he was thankful because he knew that God, and God only, had given to him this perspective.
Recall that in Deuteronomy 8:2-3, the reason that God humbled the Israelites—and now humbles us too—is because He wanted to test them so that they would know that "man does not live by bread alone, but by every word that proceeds out of the mouth of God." That was His ultimate reason. In other words, He did what He did so that they would listen to what He said. Here in Psalm 19, David demonstrates that he had been listening! He heard the "voice" of God revealing Himself, not in audible sound, but in what can be observed in the creation, and it resulted, among other things, in greater understanding, praise, and thanksgiving.
All too often, we allow the events of life to distract us from the glory of God in what He has made and in what He is doing, permitting them to divert our attention from Him and His purpose. Because of a lack of faith, we look away from the light and focus our attention on the dark, and we soon become unthankful. We would do well to imitate David in this regard.
— John W. Ritenbaugh